Ensuring environmental and social-economic sustainability in the use of materials from lignocellulosic biomass requires their fractionation and valorization of their main components. In this work, we used Eucalyptus urograndis wood to obtain chemicals and energy. The raw material was characterized in chemical terms and then subjected to autohydrolysis under variable operating conditions to optimize the extraction of hemicellulose derivatives relative to cellulose. The kinetics of the pyrolysis process was modeled in terms of activation energy and hydrogen production. Using temperatures in the range of 180–190 °C and treatment times in the range of 15–30 min allowed more than 74.5% of all hemicellulosic components in the raw material to be selectively extracted into the liquid post-hydrolysis phase, more than 90% of all glucan to remain in the solid phase and up to 27.8% of lignin to be removed. The thermal behavior of solid fraction was examined by thermogravimetric analysis, using variable heating rates under a nitrogen atmosphere, and the activation energy can be estimated by using the Flynn-Wall-Ozawa method. Based on the results, the pyrolysis of E. urograndis can be modeled as a first-order reaction. The activation energy (E_a) at a fractional conversion α between 0.3 and 0.7 was 183 to 199 KJ mol⁻¹ for the raw material, whereas that for the solid residue from autohydrolysis ranged from 179 to 186 kJ mol⁻¹ at same fractional conversion when operational temperature in autohydrolysis was upper 185 °C. Based on the results, using temperatures above 180 °C and times of 15 min or longer [i.e., operating at the (0,0) experimental point for the autohydrolysis process] in combination with degrees of conversion from 0.3 to 0.8 reduced the activation energy of the pyrolysis process in relation to the raw material by up to 12% and removed hemicellulose by more 74.5% from it. In parallel, the comparative analysis of the E_a values and the composition of the pyrolysis gas obtained showed a negative relationship between E_a and the amount of hydrogen produced.

为了确保使用木质纤维素生物质原料的环境和社会经济可持续性，需要对其主要成分进行分馏和评估。在这项工作中，我们使用了桉桉木材获得化学物质和能源。用化学术语对原料进行表征，然后在可变的操作条件下对其进行自水解，以优化相对于纤维素的半纤维素衍生物的提取。根据活化能和产氢来模拟热解过程的动力学。使用180–190°C的温度和15–30分钟的处理时间，可以将原料中所有半纤维素成分的74.5％以上选择性地提取到水解后的液体阶段，超过90％所有葡聚糖中有90％保留在固相中，最多有27.8％的木质素被去除。在氮气气氛下使用可变加热速率，通过热重分析法检查了固体馏分的热行为，活化能可以通过Flynn-Wall-Ozawa方法估算。根据结果​​，对urograndis可以建模为一阶反应。活化能（Ë_一个在转化分数）α 0.3和0.7之间为183至199摩尔KJ ^-1为原料，而对于从自动水解的固体残渣范围从179至186千焦耳摩尔^-1当自水解的操作温度高于185°C时，在相同的分数转化率下。根据结果​​，使用高于180°C的温度和15分钟或更长时间的时间（即在自动水解过程的（0,0）实验点操作）并结合将转化度从0.3降低到0.8，可以降低活化能相对于原料的热解过程最多可减少12％，从其中除去的半纤维素最多可减少74.5％。同时，对E _a值和所获得的热解气体的组成的比较分析表明，E _a与产生的氢气量之间呈负相关。